Called S&W customer service just now. Left side and right side safety plugs on their way. Great CS support from S&W!
For those wondering why I want to remove the safety. I'm buying an OWB kydex holster for the -9c so I can use it as one of my CCW choices. None of my other CCW's have a thumb safety (which is really unnecessary on the M&P line), so I want commonality of function. Also, the holster I'm buying is designed for no thumb safety models (keeps it that much thinner).
I bought the -9c for my Wife's use a few years ago. Well, I decided I'm going to buy her a new M&P 2.0 compact (no thumb safety) for home defense. She has gained enough experience, and has demonstrated her consistent ability to keep her finger out of the trigger guard until ready to fire - as such, the thumb safety is redundant.
Edit: I do plan on keeping the thumb safety so I can return the pistol to stock if needed.